+ return name;
+}
+
+int
+client_member(char *client, char *name)
+{
+ /* check if "client" (a ',' separated list of names)
+ * contains 'name' as a member
+ */
+ int l = strlen(name);
+ while (*client) {
+ if (strncmp(client, name, l) == 0 &&
+ (client[l] == ',' || client[l] == '\0'))
+ return 1;
+ client = strchr(client, ',');
+ if (client == NULL)
+ return 0;
+ client++;
+ }
+ return 0;
+}
+
+
+int
+name_cmp(char *a, char *b)
+{
+ /* compare strings a and b, but only upto ',' in a */
+ while (*a && *b && *a != ',' && *a == *b)
+ a++, b++;
+ if (!*b && (!*a || *a == ','))
+ return 0;
+ if (!*b) return 1;
+ if (!*a || *a == ',') return -1;
+ return *a - *b;
+}
+
+static char *
+add_name(char *old, char *add)
+{
+ int len = strlen(add)+2;
+ char *new;
+ char *cp;
+ if (old) len += strlen(old);
+
+ new = malloc(len);
+ if (!new) {
+ free(old);
+ return NULL;
+ }
+ cp = old;
+ while (cp && *cp && name_cmp(cp, add) < 0) {
+ /* step cp forward over a name */
+ char *e = strchr(cp, ',');
+ if (e)
+ cp = e+1;
+ else
+ cp = cp + strlen(cp);
+ }
+ strncpy(new, old, cp-old);
+ new[cp-old] = 0;
+ if (cp != old && !*cp)
+ strcat(new, ",");
+ strcat(new, add);
+ if (cp && *cp) {
+ strcat(new, ",");
+ strcat(new, cp);
+ }
+ free(old);
+ return new;